Endoscopic treatment tool and endoscopic treatment system

Abstract

An endoscopic treatment tool includes a sheath that is an elongated member having a lumen configured to extend in a longitudinal direction, a distal end treatment part provided at a distal end portion of the sheath, an operation part provided at a proximal end portion of the sheath, and a wire inserted through the lumen, mounted on the distal end treatment part, and supported by the operation part so as to advance and retract in the longitudinal direction, wherein the operation part has a locking mechanism that restricts the advancement and retract of the wire in the longitudinal direction.

What is claimed is: 
     
         1 . An endoscopic treatment tool comprising:
 a sheath having a lumen, and extending in a longitudinal direction;   a treatment part disposed distally relative to the sheath;   an operation part disposed proximally relative to the sheath, the sheath being mounted on the operation part so as to be rotatable in a circumferential direction; and   a wire inserted through the lumen, mounted on the treatment part, and supported by the operation part so as to advance and retract in the longitudinal direction and rotatable in the circumferential direction,   wherein the operation part has a locking mechanism configured to restrict the advancement and retract of the wire in the longitudinal direction.   
     
     
         2 . The endoscopic treatment tool according to  claim 1 , wherein
 the treatment part has a first through hole and a second through hole that communicate with the lumen, and   the wire is inserted through the first through hole and the second through hole and exposed to an outside of the sheath.   
     
     
         3 . The endoscopic treatment tool according to  claim 1 , wherein
 the sheath is configured to rotate in the circumferential direction in response to an rotation of the wire in the circumferential direction.   
     
     
         4 . The endoscopic treatment tool according to  claim 1 , wherein the operation part comprising:
 a main body mounted on a proximal end of the sheath;   a handle connected to the main body so as to be rotatable in the circumferential direction; and   a slider connected to the handle so as to advance and retract in the longitudinal direction,   wherein the wire is connected to a connector provided on the slider.   
     
     
         5 . The endoscopic treatment tool according to  claim 4 , wherein the locking mechanism comprises a first deformation part provided on the main body,
 the first deformation part is configured to be deformed inward in a radial direction when the main body and the handle move closer to each other, and   the first deformation part is configured to contact with the wire to restrict the advancement and retract of the wire.   
     
     
         6 . The endoscopic treatment tool according to  claim 4 , wherein the locking mechanism comprises a first deformation part provided on the handle, and
 the second deformation part is configured to be deformed inward in a radial direction when the main body and the handle move closer to each other, and   the second deformation part is configured to contact with the wire to restrict the advancement and retract of the wire.   
     
     
         7 . The endoscopic treatment tool according to  claim 4 , wherein the locking mechanism comprises a ring member configured to contact with the wire provided on the main body. 
     
     
         8 . The endoscopic treatment tool according to  claim 4 , wherein the locking mechanism comprises a first pressing member provided on the slider, and
 the first pressing member is configured to fix a position of the slider with respect to the handle.   
     
     
         9 . The endoscopic treatment tool according to  claim 4 , wherein the locking mechanism comprises a second pressing member provided on the main body, and
 the first pressing member is configured to fix a position of the wire with respect to the main body.   
     
     
         10 . The endoscopic treatment tool according to  claim 2 , wherein a marker is provided at a portion of the sheath in the circumferential direction in which the first through hole and the second through hole are provided. 
     
     
         11 . An endoscopic treatment system comprising:
 the endoscopic treatment tool according to  claim 1 ; and   an endoscope.   
     
     
         12 . The endoscopic treatment tool according to  claim 1 , wherein the operation part comprising:
 a main body comprises:
 a tapered portion tapered proximally; and 
 a stopper located proximally relative to the tapered portion. 
   
     
     
         13 . The endoscopic treatment tool according to  claim 1 , wherein the operation part comprises:
 a main body mounted on a proximal end of the sheath; and   a handle connected to the main body so as to be rotatable in the circumferential direction, the handle comprising a connector having a wedge shape.   
     
     
         14 . The endoscopic treatment tool according to  claim 1 , wherein the operation part comprises:
 a main body comprises:
 a tapered portion tapered proximally; and 
 a stopper located proximally relative to the tapered portion; and 
   a handle connected to the main body so as to be rotatable in the circumferential direction, the handle comprising a connector having a inner surface configured to press the tapered portion inwardly so that the stopper restrict the advancement and retract of the wire in the longitudinal direction.   
     
     
         15 . An treatment tool comprising:
 a sheath having a lumen, and extending in a longitudinal direction;   a treatment part disposed distally relative to the sheath;   a wire inserted through the lumen and mounted on the treatment part, the wire being rotatable in a circumferential direction; and   an operation part disposed proximally relative to the sheath, the sheath being rotatable in the circumferential direction; the operation part configured to move the wire in the longitudinal direction, the operation part comprising a surface configured to restrict the movement of the wire in the longitudinal direction.   
     
     
         16 . The treatment tool according to  claim 15 , wherein
 the operation part comprises a tapered portion configured to move inwardly, and   the surface configured to pinch the wire when the tapered portion moves inwardly.   
     
     
         17 . The treatment tool according to  claim 15 , wherein the operation part comprises:
 a main body comprises:
 a tapered portion tapered proximally; and 
 a stopper located proximally relative to the tapered portion and having the surface; and 
   a handle connected to the main body so as to be rotatable in the circumferential direction, the handle comprising a connector having a inner surface configured to press the tapered portion inwardly so that the surface restrict the movement of the wire in the longitudinal direction.   
     
     
         18 . The treatment tool according to  claim 15 , wherein the operation part comprises:
 a main body having a inner surface; and   a handle connected to the main body and comprises:
 a tapered portion tapered distally; and 
 the surface, 
   the inner surface of the main body is configured to press the tapered portion inwardly so that the surface restrict the movement of the wire in the longitudinal direction.   
     
     
         19 . The treatment tool according to  claim 15 , wherein
 the operation part comprises an O-ring having the surface.   
     
     
         20 . The treatment tool according to  claim 15 , wherein
 the operation part comprises a lever having the surface configured to press the wire.